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Re-order thumbnail for your images gallery, recommended image size: 

http://prntscr.com/gqm1wi and Add caption for each image: http://prntscr.com/gqm2g1

1, Image size: 300x610 -> add in caption image: long-pic

2, Image size: 1200x590 -> add in caption image: wide-pic

3, Image size: 800x800 -> add in caption image: small-pic